JPH0333267A - Finishing oil for treating thermoplastic synthetic fiber - Google Patents

Abstract

PURPOSE:To obtain the title finishing oil having excellent heat resistance, suppressing smoking and formation of tar substance during heating process, comprising an ester of a specific bihydric alcohol and a fatty acid as an essential component. CONSTITUTION:The aimed finishing agent comprising an ester of a bihydric alcohol (e.g. compound shown by formula II to formula IV) shown by formula I (R1 and R2 are 1-4C alkylene) and 8-24C fatty acid (e.g. 2-ethylhexanoic acid, lauric acid or stearic acid) as an essential component. The content of the ester is preferably >=20wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an oil agent for treating thermoplastic synthetic fibers, and particularly to an oil agent for treating thermoplastic synthetic fibers that undergoes a heating step.

[Conventional technology]

Conventionally, when producing thermoplastic synthetic fibers, yarns spun by a melt-spinning method are heated to draw them or heat-set to improve their properties.

In addition, in the case of thermoplastic TC fibers that undergo a false twisting process, they are generally heat treated to fix their shape, and for synthetic fibers used in industrial materials such as tire cord yarn, It is customary to draw under harsh heating conditions to obtain high strength yarns. In various manufacturing processes, fiber threads are often processed at fairly high speeds, and processing oils used on fiber threads are processed at high speeds in order to smoothly proceed with processes such as spinning, drawing, and processing. Heat resistance, smoothness, and antistatic properties are required.

In order to satisfy these demands, esters of mineral oils, higher alcohols and fatty acids, and esters of dibasic acids such as adipic acid and sebacic acid have been used as lubricant components that are blended with emulsifiers, antistatic agents, etc. Fatty acid esters of polyhydric alcohols such as trimethylolpropane, glycerin, etc. have been used.

[Problem to be solved by the invention]

However, although such conventionally used processing oils exhibit good smoothness, they are not suitable for thermoplastic synthetic fiber yarns that undergo particularly severe heating processes such as hot drawing and false twisting processes. It does not have sufficient heat resistance and may emit smoke, worsening the working environment, or form tar-like substances on the heater, making the thread path noticeably dirty and causing single thread wrapping and thread breakage.

As a result, smooth stretching and false twisting cannot be performed, and the machine must be stopped and cleaned to remove the tar-like substance, causing process troubles and reducing efficiency.

Furthermore, with the recent speeding up of textile manufacturing processes, environmental conservation in the regions where textile manufacturers are located (e.g.
There is an increasingly strong demand for improving the heat resistance of treatment oils, as there is an increasing demand for improvements in the problem of air pollution caused by smoke generation, etc.

[Means to solve the problem]

In view of this situation, the inventors of the present invention have conducted intensive studies to suppress smoke generation during the heating process and the generation of subacids in tar-like substances.The inventors of the present invention have found that using a synthetic fiber processing oil containing a specific ester compound will eliminate the above-mentioned problems. The inventors have discovered that the above problems do not occur and have completed the present invention.

That is, the present invention provides a dihydric alcohol represented by the following general formula +11 (in the formula, R, , R, each independently represents an alkylene group having 1 to 4 carbon atoms) and a fatty acid having 8 to 24 carbon atoms. The present invention provides an oil agent for treating thermoplastic synthetic fibers containing an ester of

Dihydric alcohols that are raw materials for the above esters include 2-ethylhexanoic acid, n-octanoic acid, capric acid, lauric acid, myristic acid, and palmitic acid. , stearic acid, isostearic acid, oleic acid, erucic acid, and the like. If the number of carbon atoms in the fatty acid is less than 8, the smoke prevention property will be poor, and if it is more than 24, there will be a problem of tar formation or poor smoothness.

The ester of the present invention can be obtained by subjecting the dihydric alcohol represented by the general formula +1+ to an esterification reaction with the fatty acid. The content of the ester in the synthetic fiber treatment oil of the present invention is not particularly limited, but is preferably 20% by weight or more.

The oil for treating thermoplastic synthetic fibers of the present invention may include known lubricants (for example, aliphatic monoesters such as lauryl oleate and oleyl oleate; dioleyl adipate, dioctyl phthalate, and ethylene glycol diolate) as necessary. Basic acid diesters and dihydric alcohol diesters; trimethylolpropane trilaurate,
polyhydric alcohol esters such as glycerin triolate and pentaerythritol tetraolate; polybasic acid esters such as triisostearyl trimellitate), polyoxyethylene sorbitan esters, ethylene oxide adducts of hydrogenated castor oil, and higher alcohol ethylene oxides. Emulsifiers such as adducts, higher fatty acid ethylene oxide adducts, and antistatic agents such as alkyl phosphate potassium salts, potassium oleate, dasoline-type amphoteric surfactants, and betaine-type amphoteric surfactants can be added.

The thus obtained oil agent for treating thermoplastic synthetic fibers of the present invention can be emulsified in water to form an aqueous emulsion by a conventional method, or dissolved in a low viscosity diluting solvent and used with an oiling roller, a spray method, or a nozzle. The fiber threads are oiled in an amount of 0.2 to 2.0% by weight using an oiling method or the like.

The processing agent of the present invention has the characteristics of being excellent in heat resistance, smoothness, and sizing properties, so if it takes advantage of these characteristics, it can be used as a sized Itokawa yarn processing agent, a processed yarn oil agent, or a non-sizing agent. It can also be used as a smoothing agent component in adhesive oils, tricot oils, tire cord oils, and the like.

[Effects of the Invention] The thermoplastic synthetic fibers treated with the thermoplastic synthetic fiber processing oil of the present invention exhibit extremely excellent strength loss prevention properties,
160°C or 2°C during heat stretching or heat setting process
It does not generate tar-like substances on the heater plate heated to 50"C or on the rollers, reducing work efficiency. Also, the lubrication property is as good as that used conventionally. Show your gender.

〔Example〕

The present invention will be explained below with reference to Examples, but the present invention is not limited to these Examples.

Example 1 RlR of an ester compound represented by the following -format +l[)
Oils 1 to 7 for treating thermoplastic synthetic fibers of the present invention were prepared using ester compounds and ester compounds A and B in which t, Rs, and R4 are shown in Table 1, respectively, and the heat resistance evaluation and friction measurement were conducted for each oil agent. was carried out using the following method.

In addition, as comparison products, oil agents 8 to 12 for treating thermoplastic synthetic fibers were prepared using conventionally used known recordings as shown in Table 2, and similar tests were conducted.

Ester compound A Ester compound B Table "Oil agent precepts" Note): *Compound C: Lauric acid residue (1) Heat resistance test (i) Judgment of sample color by Gardner method SUS Fi
diameter 25m5. Make a dent with a depth of 5+ nm, drop 100 ti of each evaluation oil into the dent, and set the sample temperature to 240 ml.
After heating on a heater plate for 10 minutes at 'C, the color is determined by the Gardner method.

(ii) Measurement of tar rate: Approximately 0.5 g of each evaluation oil was collected in a commercially available aluminum dish, placed in a hot air dryer, heated at 250°C for 4 hours, and then taken out. After cooling to room temperature, wash the aluminum dish with acetone.

Generally, the remaining sample that does not dissolve in acetone is a black resinous substance, and the larger the amount, the higher the rate of taring.

Incidentally, the tar rate was calculated using the following formula.

Tar conversion rate (%) = ◯ (g) of the sample taken from the floor (2) Oil agent 1 to 10 for evaluation of friction against metal test was obtained by deoiling and drying a commercially available 1260 d nylon tire cord thread. It was attached to a thread at 1%, and the coefficient of friction against metal at 200°C was measured using the running thread method.

These results are shown in Table 3.

Box 2, Indigo The results shown in Table 3 show that the oil agent for treating thermoplastic synthetic fibers of the present invention exhibits extremely superior heat resistance compared to comparative products and does not form tar-like substances. Furthermore, the coefficient of friction, that is, the lubricity, is as good as that of conventionally used oils.

Claims (1)

[Claims] 1 The following general formula (1) ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, R_1 and R_2 each independently have a carbon number of 1 to 4.
represents an alkylene group. ) An oil agent for treating thermoplastic synthetic fibers containing an ester of a dihydric alcohol represented by the following formula and a fatty acid having 8 to 24 carbon atoms as an essential component.